No Preview in the Preview Sequencer View (just white on black)
I already had a graphics cards driver problem with Blender. The developers helped me out to find out whether the problem is one with the driver.

You should use the opengl32.dll from http://download.blender.org/ftp/sergey/softwaregl/ and place it next to blender.exe as described by sergey to find out if the problem is your driver. Beware, that Blender might be very slow while using this wrapper dll as everything is done on CPU only without using your graphics card.

But in your case it should be enough to simply install a current Driver


either from AMD/ATI
or better directly from Lenovo, selecting Display and Video Graphics as your Component on this site and then choosing your OS, this will lead you to the drivers download page directly where your Graphics card is listed as well.